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A2087

Calibrated VHF noise-generator diode designed as a receiver noise-factor measurement source at frequencies to approximately 220 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 4.3 V / 600 mA

Description

The A2087 is a VHF noise-generator diode intended as a calibrated noise source for receiver noise-factor measurements at frequencies up to about 220 MHz.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
Base pins: 7
Nominal heater voltage: 4.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 200 V
Max plate dissipation: 2 W
Max cathode current: 20 mA

Directly heated tungsten-filament VHF noise-generator diode; anode is mapped to plate fields where semantically applicable.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

TUNGSTEN FILAMENT ISSUE
2
TUNGSTEN FILAMENT ISSUE 2
With a [1]
6
With a 6-:3V filament supply, a variable series resistor of 10Q max. will be suitable for
With a [2]
3
With a 6-:3V filament supply, a variable series resistor of 10Q max. will be suitable for
With a [3]
10
With a 6-:3V filament supply, a variable series resistor of 10Q max. will be suitable for
*Includes capacitance to filament, pins [1]
2 pF
*Includes capacitance to filament, pins 2 & 7 and external shield.
*Includes capacitance to filament, pins [2]
7 pF
*Includes capacitance to filament, pins 2 & 7 and external shield.
Noise Diode for use up to
220 MHz
Noise Diode for use up to 220Mc/s
Then, noise factor = [1]
10
Then, noise factor = 10 logjo (20.Ia.Rs) dB,
Then, noise factor = [2]
20
Then, noise factor = 10 logjo (20.Ia.Rs) dB,
saturated current of SmA. With a saturated current of
20 mA
saturated current of SmA. With a saturated current of 20mA the life is approximately

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

AnodeCurrentMax
20 mA
FilamentVoltageMax
4.8 V
Filament voltage range
0 to 4.3 V
Filament current (approx at Vf
4.3 V
Filament current (approx at Vf 4 3 V)
600 mA
voltage With a
6.3 V
Anode voltage
200 V
MAXIMUM RATINGS
Anode current
20 mA
MAXIMUM RATINGS
Anode dissipation
2 W
MAXIMUM RATINGS
Filament voltage
4.8 V
MAXIMUM RATINGS
Anode voltage
40 V
MAXIMUM RATINGS
Saturated anode current (approx)
7 mA
MAXIMUM RATINGS
Filament voltage (approx)
3.7 V
MAXIMUM RATINGS
Noise Diode for use up to
220 MHz
TYPICAL OPERATION
Anode voltage 100 100
100 V
TYPICAL OPERATION
Saturated anode current range 0-20 0-20
0 to 20 mA
TYPICAL OPERATION
Filament voltage range (approx) 0-4 3 0-4 3
0 to 4.3 V
TYPICAL OPERATION
range (approx) 0-13 0-14 5
0 to 20.8 dB
TYPICAL OPERATION
a saturated current of
5 mA
TYPICAL OPERATION
a saturated current of 5 mA With a saturated current of
20 mA
TYPICAL OPERATION
above is necessary for use up to
220 MHz
TYPICAL OPERATION

Characteristic

AnodeVoltageCharacteristic
40 V
SaturatedAnodeCurrent
7 mA
Anode to fi lament (approx)
1.35 pF
CAPACITANCES (measured on a cold valve fitted with external
Anode to all (approx)
2.7 pF
CAPACITANCES (measured on a cold valve fitted with external